CMMG Mk4 6mm ARC Resolute Upper Group Receiver 16.1in Coyote Tan. Harness the capability of 6mm in this uniquely designed RESOLUTE 16.1 upper. Specifications for CMMG Mk4 6mm ARC Resolute Upper Group Receiver: Manufacturer: CMMG Caliber: 6mm ARC Overall Length: 16.5 in Barrel Profile: Medium Tapered Gas System Length: Pistol Length Barrel Twist Rate: 1-7.5 Threads per Inch: 5/8×24 Muzzle Device: CMMG Zeroed Muzzle Brake Fabric/Material: 7075 T6 Aluminum Gas Block Journal Size-Diameter: .750 in Gun Rail: M-LOK Gun Type: Rifle Gun Make: CMMG Gun Model: CMMG Mk4 Weight: 3.9 lb Magazine Included: No Mount Type: M-LOK Package Contents: CMMG Mk4 6mm ARC Resolute Upper Group Receiver What firearm models does the manufacturer say CMMG Mk4 6mm ARC Resolute Upper Group Receiver is compatible with? The manufacturer suggests that CMMG Mk4 6mm ARC Resolute Upper Group Receiver is compatible with CMMG Mk4CMMG 60B1091-CT: Mk4 6mm ARC Resolute Upper Group Receiver 16.1in Coyote Tan
Grid Defense Complete Upper Receiver 9mm 9x19 Para 7.5 inch 4150 Light HBAR Barrel 1-10 Twist 7 inch Octagon M-LOK Rail A2 Flash Hider Tactical Grape
Original price was: $379.00.$309.99Current price is: $309.99. 
Geissele Super Duty Stripped Upper Receiver for AR-15 5.56mm 14.5in Barrel Carbine Length 1-7 Twist Black 14.5in
Original price was: $1,049.00.$1,025.00Current price is: $1,025.00.
CMMG Mk4 6mm ARC Resolute Upper Group Receiver 16.1in Coyote Tan
Original price was: $949.95.$829.99Current price is: $829.99.
